#include "usart.h"

static void RCC_configuration(void)
{
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
}

static void GPIO_configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure; 
  
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
}

static void USART_configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART1, &USART_InitStructure);
  
  USART_Cmd(USART1, ENABLE);
}

void USART1_Init(void)
{
  RCC_configuration();
  GPIO_configuration();
  USART_configuration();
}


/**
  * @brief Send a Char
  * @param USARTX: USART1, USART2,...
  * @param data: Need to send 
  */
void USART_sendChar(USART_TypeDef *USARTx, uint8_t data)
{
  while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
  
  USART_SendData(USARTx, data);
}

/**
  * @brief Send a Char
  * @param USARTX: USART1, USART2,...
  * @retval Received data 
  */
uint8_t USART_receiveChar(USART_TypeDef *USARTx)
{
  while (USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == RESET);
  
  return USART_ReceiveData(USARTx);
}